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2013年甘肃岷县-漳县6.6级地震烈度异常点分布及成因
陈正位1) 土登次仁2) 闫小兵3)
1)中国地震局地震预测研究所,北京市复兴路63号 100036;2)西藏自治区地震局,拉萨市娘热路22号 850000;3)山西省地震局,太原市晋祠路二段69号 030021
摘要:
2013年7月22日甘肃岷县漳县Ms6.6级地震发生在临潭—宕昌断裂的东段,遥感和DEM研究表明,该断裂东段在晚第四纪以来仍有活动,自岷县至宕昌,断裂由左旋走滑兼具有逆冲性质转变为以左旋走滑性质为主。现场烈度和灾害调查发现,Ⅶ度区内形成Ⅷ度的异常点,在Ⅵ度区内形成Ⅶ度的异常点,这些异常点沿断裂带附近约2km的范围展布,主要分布在断层的上盘。进一步的研究表明,由于临潭-宕昌断裂在岷县以南以走滑运动为主,强震动主要沿断裂传播,同时由于断裂活动形成软弱地基,强震动引起地基失效造成灾害,形成了烈度异常点。
关键词:  岷县漳县6.6级地震  临潭-宕昌断裂  地震烈度  灾害
DOI:
分类号:
基金项目:
Abnormal Earthquake Intensity Areas and Formation Mechanism of the Minxian-Zhangxian MS6. 6 Earthquake on July 22,2013, Gansu
Chen Zhengwei1),Tudentsni2),and Yan Xiaobin3)
1) Institute of Earthquake Science,CEA,Beijing 100036,China;2) Earthquake Administration of Tibet Autonomous Region,Lhasa 850000,China;3) Earthquake Administration of Shanxi Province,Taiyuan 030021,China
Abstract:
On July 22,2013,the Minxian-Zhangxian MS6. 6 earthquake occurred on the east segment of Lintan-Dangchang fault. The analysis of digital elevation and remote sensing imaging shows that the east segment of Lintan-Dangchang fault is still active and the main thrust feature of the fault switches to left lateral slip. With the field research of intensity and damage,several abnormal areas of degree Ⅷ spread in the isoseismal line of degree Ⅶ and some abnormal areas of degree Ⅶ spread in the isoseismal line of degree Ⅵ. These abnormal areas are distributed along the hanging wall of the fault in a width of 2km. The analysis based on the remote sensing and digital elevation model shows that the segment of the Lintan-Dangchang fault south of Minxian mainly slips in left literal. The fault movement made the soil soft in the fault zone. The earthquake motion propagated along the fault zone. Therefore the strong earthquake motion caused foundation failure in the soft soil along the fault zone and the abnormal intense areas of disaster formed.
Key words:  Minxian-Zhangxian MS6.6 earthquake  Lintan-Dangchang fault  Earthquake intensity  Disaster